The Workbench

Re: Piher trimpots

yachadm — Mon, 12 Oct 2009 05:41:52 GMT

Mika,

I've been using these for years with no problems. I use them specifically when adjustment must be made through a hole in the PCB from the foil side (ie - no access to the component side). All my restorations of the BG 4002, 4004, 6000 have been with these.

If there is access from the component side, then I use the Bourns 3352E Cermet trimpots.

Menahem

Re: Piher trimpots

Dillen — Fri, 02 Oct 2009 14:34:43 GMT

I have seen some. Beomaster 5500/6500 springs to mind but I've also seen them in TV's.
Though they were always for standard tiny Philips screwdrivers, rather than hex.
I've probably replaced a few but never had much trouble with this type particularly and wouldn't worry
about mounting new ones of the same type.

Martin

Re: Piher trimpots

tournedos — Fri, 02 Oct 2009 11:55:02 GMT

Exactly those. So they have most probably been replaced already, I'll just let them be.

Over here they don't have a reputation of being too reliable... but it might be just hearsay, they always worked for me.

Re: Piher trimpots

Die_Bogener — Fri, 02 Oct 2009 11:38:02 GMT

These ones?

http://www.segor.de/bilder/0000bf54.jpg

I've never seen them on a original B&O board...

But why are they "infamous"?

Piher trimpots

tournedos — Fri, 02 Oct 2009 08:47:45 GMT

Did B&O ever use those infamous black & white Piher trimpots?

I just finished otherwise repairing a BM5500 which has these at the idle current settings, and I'd like to know if they have been replaced already. The solderings look original, unlike some other places...